Presentation is as important as good content, Have attractive pictures, fonts etc. on your blog to hook the reader.
Acknowledge and appreciate your readers, especially regular readers by replying to comments and visiting their blogs.
Add your personality - If you are writing on a particular topic, there are a number of people who will be writing on the same topic. So you need to add that specialty to your blog to make it look different and to allow your readers to take away something that the others are not offering.